For the analysis of PITX3 methylation, the FFPET samples were processed according to the InnuCONVERT Bisulfite All-In-One Kit (Analytik Jena, Germany) as previously published [10 (link)]. To validate the assay performance, a serial dilution of bisulfite-converted artificially methylated DNA (CpGenome™ Universal Methylated DNA; Merck Millipore, Darmstadt, Germany) and unmethylated DNA from human sperm (NW Andrology & Cryobank Inc., Spokane, WA, USA) was used. As a calibrator sample DNA, a 1:1 mixture of bisulfite-converted unmethylated and artificially methylated DNA was used.
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